When replacing heating or adding cooling equipment in a crawl space, what is required for the existing ductwork?

The correct answer indicates that existing ductwork does not require insulation when replacing heating or adding cooling equipment in a crawl space. This is aligned with current mechanical codes that prioritize the efficiency of the HVAC system while considering the environment in which the ductwork is located.

In unconditioned spaces, such as crawl spaces, the requirement for duct insulation is often mitigated when certain conditions are met. For instance, if the ductwork is located in an area that is not exposed to extreme temperatures or outside conditions, the insulation is generally not mandatory, which underscores energy efficiency measures and practical installation considerations.

Moreover, when existing ducts are being reused for new equipment, it is essential to ensure they are sealed properly and in good condition, as insulation in such cases is a design decision based upon the specific installation rather than a strict requirement. The emphasis lies on the effectiveness of the system rather than blanket rules regarding duct insulation.